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Spinnen (Arachnida, Araneae) im Winter - kleinräumige Unterschiede als Folge tageszeitlicher Temperaturschwankungen

2010; Arachnologische Gesellschaft; Volume: 39; Linguagem: Inglês

10.5431/aramit3902

2199-7233

Julia Käser, Valentin Amrhein, Ambros Hänggi,

Orthoptera Research and Taxonomy

Spiders (Arachnida, Araneae) in winter -differences in the appearance of species in smallscale spaces as a response to daily temperature fluctuations.Pitfall traps were positioned for the investigation of the spider fauna at the northern and southern slopes of three mountain ridges (Chilchberg, Riedberg, and Buechenberg, municipalities Nünningen and Zullwil, canton Solothurn, Switzerland) within the Swiss Jura Mountains.The temperature in the upper litter was measured at three hour intervals.Independent of the weather more or less clear differences between northern and southern slopes could be observed.Maximum day temperature fluctuations of 1 5.8 °C were measured.There were no significant differences in spider communities based on quantitative comparison methods.However, a qualitative analysis showed major differences in species composition.More than 50% of all species per investigation area showed clear preferences for the northern or the southern slope, with more then two thirds of the individuals only found on either the north or south slopes.